From patchwork Wed Nov 15 12:31:06 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 838161 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3ycNzy6Cdhz9sDB for ; Wed, 15 Nov 2017 23:32:14 +1100 (AEDT) Received: from localhost ([::1]:35807 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eEwrU-000304-50 for incoming@patchwork.ozlabs.org; Wed, 15 Nov 2017 07:32:12 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60741) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eEwqk-0002yk-SV for qemu-devel@nongnu.org; Wed, 15 Nov 2017 07:31:28 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eEwqg-00029K-Uw for qemu-devel@nongnu.org; Wed, 15 Nov 2017 07:31:26 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:38506 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eEwqg-00029C-Pl for qemu-devel@nongnu.org; Wed, 15 Nov 2017 07:31:22 -0500 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id vAFCTw9J101165 for ; Wed, 15 Nov 2017 07:31:17 -0500 Received: from e12.ny.us.ibm.com (e12.ny.us.ibm.com [129.33.205.202]) by mx0b-001b2d01.pphosted.com with ESMTP id 2e8jcta3kd-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Wed, 15 Nov 2017 07:31:17 -0500 Received: from localhost by e12.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Wed, 15 Nov 2017 07:31:14 -0500 Received: from b01ledav005.gho.pok.ibm.com (b01ledav005.gho.pok.ibm.com [9.57.199.110]) by b01cxnp22036.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id vAFCVE5e48496836; Wed, 15 Nov 2017 12:31:14 GMT Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6B0EEAE04E; Wed, 15 Nov 2017 07:32:05 -0500 (EST) Received: from sbct-3.watson.ibm.com (unknown [9.47.158.153]) by b01ledav005.gho.pok.ibm.com (Postfix) with ESMTP id 54F1CAE03B; Wed, 15 Nov 2017 07:32:05 -0500 (EST) From: Stefan Berger To: qemu-devel@nongnu.org Date: Wed, 15 Nov 2017 07:31:06 -0500 X-Mailer: git-send-email 2.5.5 In-Reply-To: <1510749069-22059-1-git-send-email-stefanb@linux.vnet.ibm.com> References: <1510749069-22059-1-git-send-email-stefanb@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 17111512-0048-0000-0000-0000020649D9 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00008067; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000240; SDB=6.00946207; UDB=6.00477600; IPR=6.00726503; BA=6.00005691; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00018028; XFM=3.00000015; UTC=2017-11-15 12:31:15 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17111512-0049-0000-0000-0000432E426E Message-Id: <1510749069-22059-2-git-send-email-stefanb@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-11-15_06:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1711150172 X-MIME-Autoconverted: from 8bit to quoted-printable by mx0b-001b2d01.pphosted.com id vAFCTw9J101165 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.158.5 Subject: [Qemu-devel] [PULL 1/4] specs: Extend TPM spec with TPM emulator description X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, marcandre.lureau@gmail.com, Stefan Berger Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Following the recent extension of QEMU with a TPM emulator device, update the specs describing for how to interact with the device. The results of commands run inside a Linux VM are expected to be similar to those when the TPM passthrough device is used, so we just reuse that. Signed-off-by: Stefan Berger Reviewed-by: Marc-André Lureau --- docs/specs/tpm.txt | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) diff --git a/docs/specs/tpm.txt b/docs/specs/tpm.txt index 914daac..d1d7157 100644 --- a/docs/specs/tpm.txt +++ b/docs/specs/tpm.txt @@ -121,3 +121,82 @@ crw-------. 1 root root 10, 224 Jul 11 10:11 /dev/tpm0 PCR-00: 35 4E 3B CE 23 9F 38 59 ... ... PCR-23: 00 00 00 00 00 00 00 00 ... + + +== The QEMU TPM emulator device == + +The TPM emulator device uses an external TPM emulator called 'swtpm' for +sending TPM commands to and receiving responses from. The swtpm program +must have been started before trying to access it through the TPM emulator +with QEMU. + +The TPM emulator implements a command channel for transferring TPM commands +and responses as well as a control channel over which control commands can +be sent. The specification for the control channel can be found here: + +https://github.com/stefanberger/swtpm/blob/master/man/man3/swtpm_ioctls.pod + + +The control channel serves the purpose of resetting, initializing, and +migrating the TPM state, among other things. + +The swtpm program behaves like a hardware TPM and therefore needs to be +initialized by the firmware running inside the QEMU virtual machine. +One necessary step for initializing the device is to send the TPM_Startup +command to it. SeaBIOS, for example, has been instrumented to initialize +a TPM 1.2 or TPM 2 device using this command. + + +QEMU files related to the TPM emulator device: + - hw/tpm/tpm_emulator.c + - hw/tpm/tpm_util.c + - hw/tpm/tpm_util.h + + +The following commands start the swtpm with a UnixIO control channel over +a socket interface. They do not need to be run as root. + +mkdir /tmp/mytpm1 +swtpm socket --tpmstate dir=/tmp/mytpm1 \ + --ctrl type=unixio,path=/tmp/mytpm1/swtpm-sock \ + --log level=20 + +Command line to start QEMU with the TPM emulator device communicating with +the swtpm: + +qemu-system-x86_64 -display sdl -enable-kvm \ + -m 1024 -boot d -bios bios-256k.bin -boot menu=on \ + -chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock \ + -tpmdev emulator,id=tpm0,chardev=chrtpm \ + -device tpm-tis,tpmdev=tpm0 test.img + + +In case SeaBIOS is used as firmware, it should show the TPM menu item +after entering the menu with 'ESC'. + +Select boot device: +1. DVD/CD [ata1-0: QEMU DVD-ROM ATAPI-4 DVD/CD] +[...] +5. Legacy option rom + +t. TPM Configuration + + +The following commands should result in similar output inside the VM with a +Linux kernel that either has the TPM TIS driver built-in or available as a +module: + +#> dmesg | grep -i tpm +[ 0.711310] tpm_tis 00:06: 1.2 TPM (device=id 0x1, rev-id 1) + +#> dmesg | grep TCPA +[ 0.000000] ACPI: TCPA 0x0000000003FFD191C 000032 (v02 BOCHS \ + BXPCTCPA 0000001 BXPC 00000001) + +#> ls -l /dev/tpm* +crw-------. 1 root root 10, 224 Jul 11 10:11 /dev/tpm0 + +#> find /sys/devices/ | grep pcrs$ | xargs cat +PCR-00: 35 4E 3B CE 23 9F 38 59 ... +... +PCR-23: 00 00 00 00 00 00 00 00 ...